CN116546401A - Sound production device and terminal equipment - Google Patents

Abstract

The invention discloses a sound generating device and terminal equipment, the sound generating device comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises U-shaped iron and a magnetic circuit part, the U-shaped iron is provided with a containing groove, the magnetic circuit part comprises a main magnet and a washer which are arranged in the containing groove in a laminated mode, the main magnet is clamped between the bottom of the containing groove and the washer, the main magnet and the washer are separated from the side part of the containing groove to form a magnetic gap, the washer is provided with a concave cavity, the cross-sectional area of the concave cavity is gradually increased and then reduced from one side close to the main magnet to one side far away from the main magnet, the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is opposite to the magnetic circuit system, and one end of the voice coil far away from the vibrating diaphragm is suspended in the magnetic gap. The invention aims to provide a sound generating device which reduces the weight of a magnetic circuit and improves the magnetic flux of a magnetic gap, and the BL linear range and the inductance linear range of the sound generating device under the condition of large signals have better performance, so that the distortion is reduced, and the tone quality is improved.

Description

Sound production device and terminal equipment

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a sound generating device and terminal equipment using the sound generating device.

Background

A loudspeaker, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy by some physical effect. When different electronic energy is transmitted to the voice coil of the loudspeaker, the voice coil generates energy to interact with the magnetic field of the magnet, the interaction causes vibration of the vibrating diaphragm, and the voice coil of the loudspeaker moves forwards or backwards due to the fact that the electronic energy changes at any time, so that the vibrating diaphragm of the loudspeaker moves along with the movement, and the action changes the density degree of air to generate sound.

In the related art, the magnetic circuit structure of the speaker is mostly in a simple and regular shape, for example, hua Sichang is cylindrical or annular, the magnetic permeability of the portion of the washer with the shape is very low, and if the portion with low magnetic permeability is reserved, the performance of the speaker is further improved, the weight of the product is sacrificed, and the requirement of light weight cannot be met. Meanwhile, the relative position of the voice coil in the magnetic gap is greatly changed, a uniform magnetic field is difficult to provide by a conventional magnetic circuit structure, nonlinear distortion can be generated, and the overall sound quality of the loudspeaker is affected.

Disclosure of Invention

The invention mainly aims to provide a sound generating device and terminal equipment, and aims to provide the sound generating device which reduces the weight of a magnetic circuit and improves the magnetic flux of a magnetic gap, and the sound generating device has better performance in BL linear range and inductance linear range under the condition of large signals, reduces distortion and improves sound quality.

To achieve the above object, the present invention provides a sound emitting device including:

the magnetic circuit system comprises a U-shaped iron and a magnetic circuit part, wherein the U-shaped iron is provided with a containing groove, the magnetic circuit part comprises a main magnet and a washer which are arranged in the containing groove in a laminated mode, the main magnet is clamped between the bottom of the containing groove and the washer, the main magnet and the washer are separated from the side part of the containing groove to form a magnetic gap, the washer is provided with a concave cavity, and the cross-sectional area of the concave cavity is gradually increased and then reduced from one side close to the main magnet to one side far away from the main magnet; and

the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is opposite to the magnetic circuit system, and one end, far away from the vibrating diaphragm, of the voice coil is suspended in the magnetic gap.

In an embodiment, the washer comprises a main body and a supporting part, the main body is provided with a concave groove, the supporting part is connected to the main body and covers the notch of the concave groove, the supporting part is provided with an opening communicated with the concave groove, and the opening and the concave groove are enclosed to form the concave cavity.

In an embodiment, the supporting portion is formed by bending and extending an end portion of the main body portion adjacent to the notch of the concave groove toward the notch center of the concave groove, so that the supporting portion and the main body portion are in an integrated structure;

or, a step part is formed at the end part of the main body part adjacent to the notch of the concave groove, the supporting part is supported on the step part, and the supporting part is connected with the main body part in a riveting way so that the supporting part is flush with the end part of the main body part.

In one embodiment, the thickness of the washer along the vibration direction of the voice coil is defined as H, and H is more than or equal to 28mm and less than or equal to 32mm;

and/or defining the length of the washer along the direction perpendicular to the vibration direction of the voice coil as D, wherein D is more than or equal to 70mm and less than or equal to 74mm;

and/or the inner wall surface of the concave groove is an arc surface, and the cross-sectional area of the concave groove gradually increases from one side adjacent to the main magnet to one side adjacent to the supporting part.

In an embodiment, the thickness of the supporting portion gradually increases from the opening to the peripheral edge of the supporting portion;

and/or an included angle formed between one side of the supporting part, which is away from the main body part, and one side of the supporting part, which faces the concave groove, is greater than or equal to 4 degrees.

In an embodiment, the U-shaped iron comprises a bottom and a side part connected to the periphery of the bottom, wherein the side part and the bottom enclose to form the accommodating groove, and the distance from one end of the side part away from the bottom to the bottom is greater than or equal to the distance from one side of the washer, which is away from the main magnet, to the bottom.

In one embodiment, the side portion and the bottom portion are of an integrally formed construction;

or, the lateral part is equipped with the connection platform, the bottom is equipped with the butt platform, the butt platform with the connection platform riveting is connected.

In one embodiment, the side portion includes a first section and a second section connected, the second section being connected to the bottom portion at an end remote from the first section, the first section having a thickness d1 and the second section having a thickness d2,

d1/d2 is more than or equal to 0.8 and less than or equal to 0.9; or d1=d2.

In an embodiment, the magnetic circuit part further comprises an aluminum ring sleeved on the peripheral outer walls of the main magnet and the washer.

In one embodiment, a supporting protrusion is formed at the bottom of the accommodating groove, and the aluminum ring is supported on the supporting protrusion;

and/or the aluminum ring is bonded and connected with the main magnet and the peripheral outer wall of the washer.

In an embodiment, a supporting surface is formed on one side of the washer facing away from the main magnet, the magnetic circuit part further comprises a secondary magnet, and the secondary magnet is overlapped on the supporting surface.

In an embodiment, the bottom of the accommodating groove protrudes towards the inside of the accommodating groove to form a supporting table, the supporting table is spaced from the side part of the accommodating groove to form a clearance groove in a surrounding manner, the clearance groove is correspondingly communicated with the magnetic gap, and the main magnet is supported on the supporting table.

In one embodiment, the main magnet comprises a first magnet and a second magnet, wherein the first magnet and the second magnet are stacked and arranged between the support table and the washer;

and/or, a groove is formed on one side of the bottom wall of the U-shaped iron facing away from the accommodating groove, which corresponds to the supporting table recess;

and/or the supporting table is provided with a first through hole, the magnetic circuit part is provided with a second through hole corresponding to the first through hole, and the second through hole sequentially penetrates through the main magnet and the washer;

and/or, the sound generating device further comprises a basin frame, a connecting boss is convexly arranged on the outer wall of the U-shaped iron, the connecting boss is connected to one end of the basin frame, and the vibrating diaphragm is connected to the other end of the basin frame and opposite to the magnetic circuit system.

The invention also provides a terminal device which comprises a device shell and the sounding device, wherein the sounding device is arranged on the device shell.

According to the sound production device, the magnetic circuit system is arranged to be the U-shaped iron and the magnetic circuit part, the magnetic circuit part is installed and fixed by the containing groove of the U-shaped iron, and meanwhile, the magnetic circuit part and the side wall of the containing groove of the U-shaped iron are separated to form a magnetic gap for the voice coil of the vibration system to suspend, so that after the voice coil is electrified, the voice coil makes a motion of cutting a magnetic induction wire in the magnetic gap of the magnetic circuit system, and the vibrating diaphragm is driven to vibrate and produce sound; through including range upon range of main magnetism and the washer that sets up in the storage tank with the magnetic circuit part to be equipped with the cavity on the washer, make the cross-sectional area of cavity from the side that is close to main magnetism to the side that keeps away from main magnetism increase again and reduce, thereby cancel the low part of magnetic permeability of magnetic circuit part chinese washer, with the weight of reducing magnetic circuit part, and make full use of magnetic circuit part chinese washer magnetic permeability high part, in order to guarantee the good BL value and the linear range of sound generating mechanism, can also satisfy miniaturized, lightweight design requirement. The sounding device not only reduces the weight of a magnetic circuit and improves the magnetic flux of a magnetic gap, but also has better performance in BL linear range and inductance linear range under the condition of large signals, reduces distortion and improves sound quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a sound generating apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a portion of a sound generating apparatus according to another embodiment of the present invention;

FIG. 3 is a graph showing a magnetic induction line of a voice coil of a sound generating apparatus according to an embodiment of the present invention;

FIG. 4 is a graph showing a magnetic induction line of a voice coil of a sound generating apparatus moving downward according to an embodiment of the present invention;

fig. 5 is a simulated BL curve of a sound generating apparatus according to an embodiment of the present invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Sounding device	1211	First magnet
1	Magnetic circuit system	1212	Second magnet
				11	U iron	122	Washer
112	Bottom part	1221	Concave cavity
				1121	Abutment table	1222	Main body part
1122	Support protrusion	1223	Concave groove
				1123	Supporting table	1224	Step part
1124	Groove	1225	Support part
				1125	First through hole	1226	An opening
113	Side portion	123	Aluminum ring
				1131	First section	124	Auxiliary magnet
1132	Second section	13	Magnetic gap
				1133	Connecting table	14	Position avoiding groove
1134	Connection boss	15	Second through hole
				12	Magnetic circuit part	2	Voice coil
121	Main magnet

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

A loudspeaker, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy by some physical effect. When different electronic energy is transmitted to the voice coil of the loudspeaker, the voice coil generates energy to interact with the magnetic field of the magnet, the interaction causes vibration of the vibrating diaphragm, and the voice coil of the loudspeaker moves forwards or backwards due to the fact that the electronic energy changes at any time, so that the vibrating diaphragm of the loudspeaker moves along with the movement, and the action changes the density degree of air to generate sound.

In the related art, the magnetic circuit structure of the speaker is mostly in a simple and regular shape, for example, hua Sichang is cylindrical or annular, the magnetic permeability of the portion of the washer with the shape is very low, and if the portion with low magnetic permeability is reserved, the performance of the speaker is further improved, the weight of the product is sacrificed, and the requirement of light weight cannot be met. Meanwhile, the relative position of the voice coil in the magnetic gap is greatly changed, a uniform magnetic field is difficult to provide by a conventional magnetic circuit structure, nonlinear distortion can be generated, and the overall sound quality of the loudspeaker is affected.

Based on the above concepts and problems, the present invention proposes a sound generating apparatus 100. It will be appreciated that the sound generating apparatus 100 is applied to a terminal device, which may be an earphone, a speaker, a vehicle-mounted speaker, etc., and is not limited herein.

Referring to fig. 1 to 2 in combination, in the embodiment of the invention, the sound generating apparatus 100 includes a magnetic circuit system 1 and a vibration system, wherein the magnetic circuit system 1 includes a U-shaped iron 11 and a magnetic circuit portion 12, the U-shaped iron 11 has a receiving groove, the magnetic circuit portion 12 includes a main magnet 121 and a washer 122 stacked in the receiving groove, the main magnet 121 is sandwiched between a bottom 112 of the receiving groove and the washer 122, the main magnet 121 and the washer 122 are spaced from a side 113 of the receiving groove to form a magnetic gap 13, the washer 122 is provided with a cavity 1221, a cross-sectional area of the cavity 1221 gradually increases from a side adjacent to the main magnet 121 to a side far from the main magnet 121 and then decreases, the vibration system includes a diaphragm and a voice coil 2 connected to the diaphragm, the diaphragm is opposite to the magnetic circuit system 1, and an end of the voice coil 2 far from the diaphragm is suspended in the magnetic gap 13.

In this embodiment, the magnetic circuit 1 includes a U-shaped iron 11 and a magnetic circuit portion 12, the U-shaped iron 11 is disposed in a U-shape, at this time, the U-shaped iron 11 has a receiving groove with an opening at one end, a notch of the receiving groove of the U-shaped iron 11 is opposite to the diaphragm, the magnetic circuit portion 12 is disposed in the receiving groove and is spaced from a side wall of the receiving groove to form a magnetic gap 13 by enclosing, one end of the voice coil 2 in the vibration system is connected with the diaphragm, and the other end of the voice coil 2 is suspended in the magnetic gap 13, so that when the voice coil 2 is energized, the voice coil 2 introduces electric energy into the magnetic gap 13 of the magnetic circuit 1, under the magnetic field effect of the magnetic circuit 1, the voice coil 2 is driven to perform cutting magnetic induction line operation, so that the electric energy is converted into mechanical energy, and when the voice coil 2 moves, the diaphragm is driven to vibrate, so that the diaphragm vibrates to sound, so that the mechanical energy is converted into acoustic energy, and electroacoustic conversion is realized.

In order to further improve the installation stability of the magnetic circuit system 1 and the vibration system, in an embodiment, the sound generating apparatus 100 further includes a frame, the frame has a cavity, the magnetic circuit system 1 is disposed in the cavity, and the vibrating diaphragm is connected to the frame and opposite to the magnetic circuit system 1. Of course, in other embodiments, the basin frame may be provided as a cavity with two open ends, and the U-iron 11 of the magnetic circuit system 1 is connected to one open end of the basin frame, and the diaphragm is connected to the other open end of the basin frame, which is not limited herein.

It can be understood that the basin stand is used for installing, fixing, supporting and protecting the components such as the vibration system and the magnetic circuit system 1, namely, the basin stand provides an installation foundation for the components such as the vibration system and the magnetic circuit system 1. It is understood that the basin stand may be a structure such as a mounting shell, a housing or a box with a cavity, that is, the basin stand defines a containing space, which is not limited herein.

Alternatively, the basin stand can be cylindrical, square or horn-shaped. The cavity of the basin stand can be a cavity structure with one end open, and of course, the cavity structure with two ends open. In this embodiment, the basin frame is a cylindrical or basin-shaped structure with an opening at one end, the magnetic circuit system 1 is disposed in the cavity of the basin frame, and the periphery of the vibrating diaphragm of the vibrating system is connected and fixed with one end of the basin frame, and the opening is covered, so that the vibrating diaphragm is opposite to the magnetic circuit system 1 to form a vibrating space of the sound generating device 100.

In this embodiment, the U iron 11 of the magnetic circuit system 1 is disposed in the accommodating cavity of the basin stand, and the notch of the accommodating groove is opposite to the vibrating diaphragm. It can be understood that when the basin stand is a metal piece, the magnetic circuit system 1 and the basin stand are bonded or welded and fixed, so as to improve the heat dissipation effect of the sound generating device 100. In another embodiment, when the basin frame is formed by plastic injection molding, the U-iron 11 of the magnetic circuit system 1 may be injection molded in the basin frame as an insert, or the magnetic circuit system 1 and the basin frame may be fixed by bonding, and then other parts are fixed by bonding, which is not limited herein.

In this embodiment, as shown in fig. 1 and 2, the magnetic circuit portion 12 includes a main magnet 121 and a washer 122, which are stacked, the main magnet 121 being selected as a magnet, and the washer 122 being selected as a magnetically conductive plate structure. By providing the cavity 1221 on the washer 122, and gradually increasing and decreasing the cross-sectional area of the cavity 1221 of the washer 122 from the side adjacent to the main magnet 121 to the side far from the main magnet 121, the portion of the magnetic circuit portion 12 with low magnetic permeability of the washer 122 is eliminated, so as to reduce the weight of the magnetic circuit portion 12, and fully utilize the portion of the magnetic circuit portion 12 with high magnetic permeability of the washer 122, so that the good BL value and linear range of the sound generating device 100 can be ensured, and the design requirements of miniaturization and light weight can be satisfied.

It will be appreciated that the main magnet 121 may alternatively be a plate-like or disc-like structure, with the outline of the main magnet 121 being identical or identical to the outline of the shape of the washer 122. Alternatively, the main magnet 121 and the washer 122 may be circular, elliptical, square, racetrack, or the like, and are not limited thereto.

In the present embodiment, the shape profile of the main magnet 121 and the washer 122 of the magnetic circuit portion 12 is substantially similar to the shape profile of the accommodating groove of the U-iron 11. Alternatively, the U-iron 11 is a cylindrical structure with one end open. The main magnet 121 and the washer 122 of the magnetic circuit part 12 are sequentially stacked from bottom to top in the accommodating groove, so that one side of the main magnet 121 facing away from the washer 122 is connected to the bottom wall of the accommodating groove, and the side walls of the main magnet 121 and the washer 122 are spaced from the side walls of the accommodating groove to form the magnetic gap 13.

According to the sound production device 100, the magnetic circuit system 1 is arranged into the U-shaped iron 11 and the magnetic circuit part 12, the magnetic circuit part 12 is installed and fixed by utilizing the accommodating groove of the U-shaped iron 11, and meanwhile, the magnetic gap 13 for the voice coil 2 of the vibration system to suspend is formed between the magnetic circuit part 12 and the side wall of the accommodating groove of the U-shaped iron 11, so that after the voice coil 2 is electrified, the voice coil 2 makes a movement of cutting a magnetic induction line in the magnetic gap 13 of the magnetic circuit system 1, and the vibration of the vibrating diaphragm is driven to produce sound; by arranging the magnetic circuit portion 12 including the main magnet 121 and the washer 122 stacked in the accommodating groove and providing the concave cavity 1221 on the washer 122, the cross-sectional area of the concave cavity 1221 gradually increases and decreases from the side adjacent to the main magnet 121 to the side far away from the main magnet 121, thereby canceling the portion of the magnetic circuit portion 12 where the magnetic permeability of the washer 122 is low, so as to reduce the weight of the magnetic circuit portion 12, and fully utilizing the portion of the magnetic circuit portion 12 where the magnetic permeability of the washer 122 is high, so that the design requirements of miniaturization and light weight can be satisfied while ensuring good BL value and linearity range of the sound generating device 100. The sound generating device 100 not only reduces the weight of a magnetic circuit and improves the magnetic flux of a magnetic gap, but also has better performance in BL linear range and inductance linear range under the condition of large signals, reduces distortion and improves sound quality.

In the present embodiment, the cross-sectional area of the cavity 1221 is an area along a cross-section perpendicular to the moving direction of the voice coil 2. Alternatively, the cavity 1221 is provided in a bowl-like or jar-like configuration, i.e., the cross-sectional area of the cavity 1221 increases and decreases from the side adjacent to the main magnet 121 to the side remote from the main magnet 121.

It is understood that the cavity 1221 may alternatively be a groove structure, a through groove structure, or the like, and is not limited herein. Optionally, a cavity 1221 is located in the middle of the washer 122. By arranging the concave cavity 1221 on the washer 122, the washer 122 is in a stepped structure, so that the part of the washer 122 with low magnetic permeability is canceled by the concave cavity 1221, the weight of the washer 122 is reduced, the weight reduction purpose is achieved, and the magnetic permeability and the magnetic field strength of the washer 122 under the action of the main magnet 121 are ensured.

In order to further increase the magnetic flux density at the magnetic gap 13, the inner wall of the cavity 1221 is provided with an arc surface, so that the airflow generated by vibration of the diaphragm flows more smoothly. In this embodiment, as shown in fig. 1 and 2, the concave cavity 1221 of the washer 122 of the present invention removes the portion of the washer 122 with low magnetic permeability, so that the magnetic flux density of the washer 122 can be increased, and thus, the weight of the washer 122 can be effectively reduced and the use efficiency of the washer 122 can be improved on the premise of ensuring the magnetic flux.

It will be appreciated that in order to ensure that the voice coil 2 of the vibration system is capable of cutting the magnetically induced linear motion within the magnetic gap 13, a constant number of maximum displacements of the voice coil 2 within the magnetic gap 13 may be maintained, the voice coil 2 being a long voice coil. Of course, the voice coil 2 may be a short voice coil, which is not limited herein. As shown in fig. 3 to 5, the stepped washer 122 is matched, so that the washer 122 is stepped near the magnetic gap 13, the magnetic flux density at the magnetic gap 13 can be increased, the magnetic flux density in the magnetic gap 13 is more uniform, the sound generating device 100 is ensured to have higher sensitivity, and the linear range of the sound generating device 100 is increased under the condition of ensuring the BL value.

It should be noted that, the sound generating device 100 in the present application utilizes the magnetic circuit portion 12 to match with a short voice coil, so as to ensure that the vibration range of the voice coil 2 of the sound generating device 100 is always in a uniform magnetic field range, and achieves a hundred-percent coupling with the magnetic field.

In the present embodiment, by adopting a structure in which the main magnet 121 is combined with the bowl-shaped washer 122, the washer 122 is eliminated from a portion having a low intermediate magnetic permeability as compared with a conventional cylindrical washer, and a cavity structure in which the diameter is gradually increased from the lower surface and finally contracted to be smaller is formed in the inside of the washer 122, as shown in fig. 1 and 2.

It will be appreciated that the inner wall of the cavity 1221 of the washer 122 is formed by a plurality of circular arcs having the same radius and different circle centers, a cross section is defined by a symmetry axis passing through the magnetic circuit portion 12, an intersection point of the circle center of the upper surface of the washer 122 and the symmetry axis is defined as an origin of coordinates, the symmetry axis is defined as a y axis, the radius of the circular arc is defined as R, and coordinates of the circle center are defined as (x, y). Alternatively, 26 mm.ltoreq.R.ltoreq.28 mm. Defining the thickness H of the washer 122 along the y-axis direction, the length of the washer 122 along the x-axis direction is D, and in the embodiment, the coordinates of the circle center satisfy the following relationship that 0.065.ltoreq.x/D.ltoreq. 0.075,0.12.ltoreq.y/H.ltoreq.0.15.

In one embodiment, the thickness of the washer 122 in the vibration direction of the voice coil 2 is defined as H, and 28 mm.ltoreq.H.ltoreq.32 mm. Alternatively, the thickness H of the washer 122 in the vibration direction of the voice coil 2 is 28mm, 29mm, 30mm, 31mm, 32mm, or the like, which is not limited herein.

In one embodiment, the length of the washer 122 in the direction perpendicular to the vibration direction of the voice coil 2 is defined as D,70 mm.ltoreq.D.ltoreq.74 mm. Alternatively, the length D of the washer 122 in the direction perpendicular to the vibration direction of the voice coil 2 is 70mm, 71mm, 72mm, 73mm, 74mm, or the like, which is not limited herein. Of course, the washer 122 may be selected to be circular, and the length D of the washer 122 in the direction perpendicular to the vibration direction of the voice coil 2 may be selected to be the outer diameter of the washer 122.

In one embodiment, the washer 122 includes a main body 1222 and a support portion 1225, the main body 1222 is provided with a recess 1223, the support portion 1225 is connected to the main body 1222 and covers the notch of the recess 1223, the support portion 1225 is provided with an opening 1226 communicating with the recess 1223, and the opening 1226 and the recess 1223 enclose a cavity 1221.

In the present embodiment, as shown in fig. 1 and 2, by providing the washer 122 as the main body 1222 and the support part 1225, by providing the recess groove 1223 in the main body 1222 and connecting the support part 1225 to an end of the main body 1222 adjacent to the notch of the recess groove 1223, such that the support part 1225 covers the notch of the recess groove 1223, and by providing the support part 1225 with the opening 1226 communicating with the recess groove 1223, such that the opening 1226 and the recess groove 1223 enclose to form the cavity 1221.

Alternatively, the inner wall surface of the concave groove 1223 is an arc surface, and the cross-sectional area of the concave groove 1223 gradually increases from the side adjacent to the main magnet 121 to the side adjacent to the support portion 1225.

It is understood that the concave groove 1223 may be alternatively a groove structure or a through groove structure, etc., and is not limited herein. The concave groove 1223 is formed by recessing the side of the washer 122 facing away from the main magnet 121 toward the main magnet 121, so that the main body 1222 of the washer 122 is formed into a stepped structure, and the part of the main body 1222 of the washer 122 with low magnetic permeability is eliminated by the concave groove 1223, so that the weight of the washer 122 is reduced, the weight is reduced, and the magnetic permeability and the magnetic field strength of the washer 122 under the action of the main magnet 121 are ensured. Optionally, a concave trough 1223 is located in the middle of the wafer 122.

In the present embodiment, by providing the support portion 1225 at one end of the main body portion 1222 adjacent to the notch of the recess groove 1223, the contact area of the washer 122 with the sub-magnet 124 is further increased by the support portion 1225, thereby improving the mounting stability of the sub-magnet 124. In one embodiment, a supporting surface is formed on a side of the washer 122 facing away from the main magnet 121, and the magnetic circuit portion 12 further includes a sub-magnet 124, where the sub-magnet 124 is stacked on the supporting surface.

As can be appreciated, as shown in fig. 1 and 2, a side of the support portion 1225 facing away from the cavity 1221 forms a support surface, and the auxiliary magnet 124 is stacked on the support surface. In the present embodiment, the sub-magnet 124 is adhesively attached to the supporting portion 1225, thereby satisfying the requirement of light weight while ensuring that the sound generating apparatus 100 has a good linear range.

In one embodiment, as shown in fig. 1, the support portion 1225 is formed by bending and extending an end of the body portion 1222 adjacent to the notch of the recess groove 1223 toward the notch center of the recess groove 1223, so that the support portion 1225 and the body portion 1222 are an integrally formed structure. It will be appreciated that the washer 122 is a unitary structure, which simplifies the processing and structural strength of the washer 122.

In another embodiment, as shown in fig. 2, the end of the body portion 1222 adjacent to the notch of the recess 1223 is formed with a step portion 1224, a support portion 1225 is supported on the step portion 1224, and the support portion 1225 is riveted with the body portion 1222 so that the support portion 1225 is flush with the end of the body portion 1222.

In the present embodiment, the washer 122 is configured as a two-part structure of the main body 1222 and the support 1225, and the two-part structure of the main body 1222 and the support 1225 are connected into an integral structure by riveting, so that a separate processing mode is adopted, the processing precision is ensured, and meanwhile, the processing difficulty is reduced, and the cost is saved.

In one embodiment, the thickness of the support portion 1225 increases gradually from the opening 1226 to the peripheral edge of the support portion 1225. It will be appreciated that such an arrangement ensures both the contact area of the support 1225 with the secondary magnet 124 and the weight of the washer 122.

Alternatively, the side of the support portion 1225 facing away from the main body portion 1222 forms an angle of greater than or equal to 4 ° with the side of the support portion 1225 facing the recess 1223. In this embodiment, a side of the supporting portion 1225 facing away from the main body 1222 is a supporting surface, a side of the supporting portion 1225 facing the recess 1223 is an inner side surface, and an included angle is formed between a plane of the supporting surface and a plane of the inner side surface, and the included angle is greater than or equal to 4 °. Optionally, the support surface is parallel to the horizontal plane. It can be appreciated that such an arrangement achieves the light-weight requirements while ensuring that the sound generating apparatus 100 has a good linear range.

In an embodiment, the U-shaped iron 11 includes a bottom 112 and a side portion 113 connected to a periphery of the bottom 112, wherein the side portion 113 and the bottom 112 enclose a receiving groove, and a distance from an end of the side portion 113 away from the bottom 112 to the bottom 112 is greater than or equal to a distance from a side of the washer 122 facing away from the main magnet 121 to the bottom 112.

In the present embodiment, as shown in fig. 1 and 2, the U-iron 11 may be selected to have a cylindrical structure with an opening at one end. The U-iron 11 includes a bottom 112 and a side 113 disposed around the periphery of the bottom 112 such that the side 113 and the bottom 112 enclose a receiving groove. Optionally, the bottom 112 is a planar plate-like structure.

In an embodiment, the bottom 112 of the accommodating groove protrudes towards the inside of the accommodating groove to form a supporting table 11233, the supporting table 11233 is spaced from the side 113 of the accommodating groove to form a clearance groove 14, the clearance groove 14 is correspondingly communicated with the magnetic gap 13, and the main magnet 121 is supported on the supporting table 11233.

In this embodiment, as shown in fig. 1 and 2, by providing the support table 1123 on the bottom wall of the accommodating groove of the U-shaped iron 11, the support table 1123 is spaced from the side wall of the accommodating groove to form the space avoiding groove 14, and the space avoiding groove 14 is correspondingly communicated with the magnetic gap 13, so that the moving of the voice coil 2 in the magnetic gap 13 is avoided by the space avoiding groove 14 while the magnetic circuit portion 12 is supported and fixed by the support table 1123, so as to ensure the amplitude of the sound generating device 100.

It is understood that the support table 1123 may be a convex structure protruding from the bottom wall of the receiving groove. Of course, the support base 1123 may be formed by protruding from the side of the U-shaped iron 11 facing away from the bottom wall of the accommodating groove toward the inside of the accommodating groove, and is not limited thereto. Optionally, a side of the U-shaped iron 11 facing away from the bottom wall of the accommodating groove is recessed to form a groove 1124 corresponding to the support table 11233.

In one embodiment, as shown in FIG. 1, the side portion 113 and the bottom portion 112 are integrally formed. It will be appreciated that the side portion 113 and the bottom portion 112 of the U-shaped iron 11 may be formed by injection molding integrally, which may simplify the processing steps of the U-shaped iron 11 and improve the structural strength of the U-shaped iron 11.

In one embodiment, as shown in fig. 2, the side portion 113 is provided with a connection table 1133, the bottom portion 112 is provided with an abutment table 1121, and the abutment table 1121 is riveted to the connection table 1133. It can be appreciated that by arranging the U-shaped iron 11 as a two-part structure of the side portion 113 and the bottom portion 112, the side portion 113 is in a cylindrical structure with two open ends, the connecting table 1133 is arranged at the opening of one end of the side portion 113, and the abutting table 1121 is arranged at the periphery of the bottom portion 112, so that the abutting table 1121 of the bottom portion 112 is riveted with the connecting table 1133 of the side portion 113, and the processing precision is ensured, meanwhile, the processing difficulty is reduced, and the cost is saved.

In one embodiment, the side portion 113 includes a first section 1131 and a second section 1132 connected, wherein an end of the second section 1132 away from the first section 1131 is connected to the bottom portion 112, the thickness of the first section 1131 is defined as d1, the thickness of the second section 1132 is defined as d2, and 0.8.ltoreq.d1/d2.ltoreq.0.9; or d1=d2.

In this embodiment, as shown in fig. 1, 3 and 4, by setting the side portion 113 of the U-shaped iron 11 to have a shape with unequal thickness, that is, dividing the side portion 113 into an upper portion and a lower portion with the center of the washer 122 as a boundary, that is, a first section 1131 and a second section 1132, the thickness of the first section 1131 of the upper portion is defined as d1, and the thickness of the second section 1132 of the lower portion is defined as d2, so that 0.8 d1/d2 is equal to or less than 0.9, thereby ensuring that the side portion 113 with unequal thickness is matched with the stepped washer 122, so that the magnetic flux in the magnetic gap 13 is more uniform.

Of course, in other embodiments, as shown in fig. 2, the thickness d1 of the first section 1131 is the same as the thickness d2 of the second section 1132, which is not limited herein.

In one embodiment, magnetic circuit portion 12 further includes an aluminum ring 123, aluminum ring 123 being sleeved around the peripheral outer walls of main magnet 121 and washer 122.

In this embodiment, as shown in fig. 1 and 2, by arranging the aluminum ring 123 on the outer sides of the main magnet 121 and the washer 122, the aluminum ring 123 is bonded to the peripheral outer walls of the main magnet 121 and the washer 122, so that the aluminum ring 123 acts as a secondary voice coil, the formation of back electromotive force is reduced, and the third harmonic distortion is reduced.

In order to further improve the mounting stability of the aluminum ring 123, in one embodiment, as shown in fig. 1 and 2, the bottom 112 of the receiving groove is formed with a supporting protrusion 1122, and the aluminum ring 123 is supported on the supporting protrusion 1122. It is understood that the support protrusions 1122 are provided on the side of the support table 1123 facing the avoidance slot 14.

In one embodiment, as shown in fig. 2, the main magnet 121 includes a first magnet 1211 and a second magnet 1212, and the first magnet 1211 and the second magnet 1212 are stacked and sandwiched between the support table 11233 and the washer 122.

It can be appreciated that the processing difficulty of the main magnet 121 is reduced by providing the main magnet 121 as a two-part structure of the first magnet 1211 and the second magnet 1212. Alternatively, as shown in fig. 2, the thickness of the first magnet 1211 is the same as the thickness of the second magnet 1212. Of course, in other embodiments, the thickness of the first magnet 1211 is different from the thickness of the second magnet 1212, which is not limited herein.

In one embodiment, the magnetization direction of the first magnet 1211 is the same as the magnetization direction of the second magnet 1212. It can be appreciated that by setting the magnetizing directions of the first magnet 1211 and the second magnet 1212 to be the same, the manufacturing process can be simplified and the assembling difficulty can be reduced.

In one embodiment, as shown in fig. 1 and 2, the support table 11233 is provided with a first through hole 1125, and the magnetic circuit portion 12 is provided with a second through hole 15 corresponding to the first through hole 1125, the second through hole 15 penetrating the main magnet 121 and the washer 122 in order.

It can be understood that the basin frame is provided with a through hole communicated with the accommodating cavity, the U iron 11 is provided with a first through hole 1125 penetrating through the bottom wall of the accommodating groove corresponding to the through hole, the magnetic circuit part 12 is provided with a second through hole 15 corresponding to the first through hole 1125, that is, the auxiliary magnet 124, the washer 122 and the main magnet 121 are all provided with the second through holes 15. In this embodiment, the second through hole 15 penetrates the bottom wall of the recessed groove 1223/cavity 1221.

In the present embodiment, as shown in fig. 1 and 2, by providing through holes in the frame and providing a through hole structure corresponding to the through holes in the magnetic circuit portion 12, air pressure balance in the vibration space is ensured when the voice coil 2 vibrates the diaphragm. It can be understood that the through hole is arranged on the bottom wall of the accommodating cavity of the basin frame and penetrates through the bottom wall of the accommodating cavity. The magnetic circuit part 12 is fixed on the bottom wall of the basin frame accommodating cavity, the U iron 11 of the magnetic circuit system 1 is provided with a first through hole 1125, and the auxiliary magnet 124, the washer 122 and the main magnet 121 of the magnetic circuit part 12 are provided with second through holes 15.

It will be appreciated that the first through hole 1125 and the second through hole 15 are coaxially disposed. The shapes and contours of the first through hole 1125 and the second through hole 15 are the same, and the first through hole 1125 and the second through hole 15 may be selected from circular holes, elliptical holes, triangular holes, square holes, etc., which are not limited herein.

In the present embodiment, the second through hole 15 penetrates the bottom wall of the concave groove 1223, so that the weight of the washer 122 can be further reduced, and the weight reduction purpose is achieved. Optionally, the second through hole 15 is disposed in the middle or middle position of the cavity, so as to ensure that the magnetic flux density in the magnetic gap 13 is uniform, and avoid polarization or swinging of the voice coil 2, so as to improve the sound emitting effect of the sound emitting device 100.

In an embodiment, the sound generating apparatus 100 further includes a frame, the outer wall of the U-shaped iron 11 is convexly provided with a connection boss 1134, the connection boss 1134 is connected to one end of the frame, and the diaphragm is connected to the other end of the frame and opposite to the magnetic circuit system 1.

In this embodiment, as shown in fig. 1 and 2, the connection stability between the frame and the U-shaped iron 11 can be improved when the U-shaped iron 11 and the frame are integrally injection-molded by providing the connection boss 1134 protruding from the side portion 113 of the U-shaped iron 11.

It will be appreciated that existing loudspeakers suffer significant distortion at low frequencies, particularly around resonance frequencies. The sound generating device 100 of the present application can greatly reduce the distortion of the speaker near the resonance frequency F0, and control the distortion to about 0.5%. Compared with a conventional magnetic circuit, the magnetic circuit structure of the sound generating device 100 has larger magnetic gap magnetic flux, high speaker efficiency, BL linearity and inductance linearity under the large signal working condition are obviously superior to those of the conventional structure, and nonlinear distortion caused by driving force of the speaker is reduced. Meanwhile, the magnetic circuit structure of the sound generating device 100 of the application well realizes that the light-weight design requirement of the loudspeaker is met under the condition of building large magnetic flux, and the difficulty of later assembly is reduced.

The invention also provides a terminal device, which comprises a device shell and the sounding device 100, wherein the sounding device 100 is arranged on the device shell. The specific structure of the sound generating apparatus 100 refers to the foregoing embodiments, and since the present terminal device adopts all the technical solutions of all the foregoing embodiments, at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which are not described in detail herein.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims (14)

1. A sound emitting device, the sound emitting device comprising:

the magnetic circuit system comprises a U-shaped iron and a magnetic circuit part, wherein the U-shaped iron is provided with a containing groove, the magnetic circuit part comprises a main magnet and a washer which are arranged in the containing groove in a laminated mode, the main magnet is clamped between the bottom of the containing groove and the washer, the main magnet and the washer are separated from the side part of the containing groove to form a magnetic gap, the washer is provided with a concave cavity, and the cross-sectional area of the concave cavity is gradually increased and then reduced from one side close to the main magnet to one side far away from the main magnet; and

the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is opposite to the magnetic circuit system, and one end, far away from the vibrating diaphragm, of the voice coil is suspended in the magnetic gap.

2. The sound generating apparatus according to claim 1, wherein the washer comprises a main body and a supporting portion, the main body is provided with a concave groove, the supporting portion is connected to the main body and covers a notch of the concave groove, the supporting portion is provided with an opening communicating with the concave groove, and the opening and the concave groove are enclosed to form the concave cavity.

3. The sound generating apparatus according to claim 2, wherein the support portion is formed by bending and extending an end portion of the body portion adjacent to the notch of the concave groove toward a notch center of the concave groove, so that the support portion and the body portion are of an integrally formed structure;

or, a step part is formed at the end part of the main body part adjacent to the notch of the concave groove, the supporting part is supported on the step part, and the supporting part is connected with the main body part in a riveting way so that the supporting part is flush with the end part of the main body part.

4. The sound generating apparatus according to claim 2, wherein a thickness of the washer in a vibration direction of the voice coil is defined as H, and H is 28 mm.ltoreq.h.ltoreq.32 mm;

and/or defining the length of the washer along the direction perpendicular to the vibration direction of the voice coil as D, wherein D is more than or equal to 70mm and less than or equal to 74mm;

and/or the inner wall surface of the concave groove is an arc surface, and the cross-sectional area of the concave groove gradually increases from one side adjacent to the main magnet to one side adjacent to the supporting part.

5. The sound generating apparatus according to claim 2, wherein a thickness of the supporting portion gradually increases from the opening to a peripheral edge of the supporting portion;

and/or an included angle formed between one side of the supporting part, which is away from the main body part, and one side of the supporting part, which faces the concave groove, is greater than or equal to 4 degrees.

6. The sound generating device of claim 1, wherein the U-shaped iron comprises a bottom and a side connected to the periphery of the bottom, the side and the bottom enclose to form the accommodating groove, and a distance from one end of the side away from the bottom to the bottom is greater than or equal to a distance from one side of the washer facing away from the main magnet to the bottom.

7. The sound emitting apparatus of claim 6, wherein the side portion is of unitary construction with the bottom portion;

or, the lateral part is equipped with the connection platform, the bottom is equipped with the butt platform, the butt platform with the connection platform riveting is connected.

8. The sound emitting device of claim 6, wherein the side portion comprises a first section and a second section connected, the second section being connected to the bottom portion at an end remote from the first section, the first section having a thickness d1 and the second section having a thickness d2,

d1/d2 is more than or equal to 0.8 and less than or equal to 0.9; or d1=d2.

9. The sound emitting apparatus of any one of claims 1 to 8, wherein the magnetic circuit portion further comprises an aluminum ring that is sleeved around the peripheral outer wall of the main magnet and the washer.

10. The sound generating apparatus according to claim 9, wherein a supporting protrusion is formed at a bottom of the receiving groove, and the aluminum ring is supported by the supporting protrusion;

and/or the aluminum ring is bonded and connected with the main magnet and the peripheral outer wall of the washer.

11. The sound generating apparatus according to any one of claims 1 to 8, wherein a supporting surface is formed on a side of the washer facing away from the main magnet, the magnetic circuit portion further includes a sub-magnet, and the sub-magnet is laminated on the supporting surface.

12. The sound generating apparatus according to any one of claims 1 to 8, wherein a bottom of the accommodating groove protrudes into the accommodating groove to form a supporting table, the supporting table is spaced from a side portion of the accommodating groove to enclose to form a space avoiding groove, the space avoiding groove is correspondingly communicated with the magnetic gap, and the main magnet is supported on the supporting table.

13. The sound generating apparatus of claim 12, wherein the main magnet comprises a first magnet and a second magnet, the first magnet and the second magnet being stacked and sandwiched between the support table and the washer;

and/or, a groove is formed on one side of the bottom wall of the U-shaped iron facing away from the accommodating groove, which corresponds to the supporting table recess;

and/or the supporting table is provided with a first through hole, the magnetic circuit part is provided with a second through hole corresponding to the first through hole, and the second through hole sequentially penetrates through the main magnet and the washer;

and/or, the sound generating device further comprises a basin frame, a connecting boss is convexly arranged on the outer wall of the U-shaped iron, the connecting boss is connected to one end of the basin frame, and the vibrating diaphragm is connected to the other end of the basin frame and opposite to the magnetic circuit system.

14. A terminal device comprising a device housing and a sound emitting apparatus according to any one of claims 1 to 13, wherein the sound emitting apparatus is provided in the device housing.